Experimental Study On Typical Odor-causing Substances In UV/H₂O₂ Advanced Oxidation Water And Its Application In Water Purification Plants

In recent years,with the increasing demand for drinking water and the increasingly serious pollution of water sources,the problem of drinking water has attracted wide attention from all walks of life.The problem of drinking water not only threatens our health,but also affects people's production and life,causes social and economic losses.Certain substances that cause the smell of drinking water can cause damage to people's skin and mucous membranes,and cause irreversible damage to people's bodies.The typical pollutants causing the smell problem of drinking water are geosin(GSM)and 2-methyl isopropanol(2-MIB).Traditional water treatment technologies are difficult to remove these two substances effectively,while the current advanced treatment technologies have some problems,such as large area,easy to produce carcinogens and so on.UV/H₂O₂advanced oxidation technology can not only efficiently remove GSM and 2-MIB,but also has the characteristics of no secondary pollution and small footprint,so it has a broad development prospect in the field of drinking water treatment.Therefore,this paper carried out the pilot test of UV/H₂O₂oxidation degradation of olfactory substances,the trial operation analysis of introducing UV/H₂O₂advanced oxidation technology into waterworks and the actual operation effect analysis of waterworks.Firstly,Using the filtered water of Quehua Waterworks as the experimental water,the pilot-scale equipment was used to explore the effect,reaction kinetics and influencing factors of advanced oxidative degradation of GSM and 2-MIB by UV/H₂O₂in Jinan Quehua pilot plant.The results showed that:(1)When the H₂O₂concentration is 5 mg/L and the UV intensity is523.7?W/cm²,the UV/H₂O₂advanced oxidation technology can achieve 76.78%and 64.61%removal rates for GSM and 2-MIB,respectively.(2)The degradation of GSM and 2-MIB accorded with the first-order kinetics.(3)Increasing the dosage of UV,H₂O₂and increasing the temperature can promote the degradation of GSM and 2-MIB.(4)Under acidic conditions,the degradation effects of GSM and 2-MIB were better than those of alkaline conditions.(5)Humic acid and anion concentrations exhibited obvious inhibitory effect on the degradation reaction.Secondly,based on the newly built Shuanglong Lake Water Plant(Qingyun County,Dezhou),the UV/H₂O₂advanced oxidation process was selected to deal with the GSM and2-MIB pollution problems in the water body of the Yellow River Diversion Reservoir.Through the optimal parameters of UV/H₂O₂advanced oxidation operation were explored through the analysis of the test equipment of Qingyun Shuanglong Lake Waterworks.The results suggested that during the operation of UV/H₂O₂advanced oxidation process in Shuanglong Lake Waterworks,the optimal concentration range of H₂O₂is 15 mg/L?20 mg/L,UV light intensity range was 400 mj/cm²;when the concentration of H₂O₂is 20 mg/L and the UV dose is 400mj/cm²,the removal rate of GSM and 2-MIB by UV/H₂O₂process can reach 82.4%and 75.64%,respectively.Finally,through the analysis of the trial operation of Shuanglong Lake Waterworks and the effluent quality of the waterworks,this work explored the effect of UV/H₂O₂advanced oxidation technology in the stable treatment of the water from the Yellow River diversion reservoir.The results indicated that:(1)The actual treatment efficiencies of GSM and 2-MIB in the water diversion reservoir by UV/H₂O₂technology were close to 80%.(2)The removal rates of TOC,COD_Mnand UV₂₅₄can reach 48%,40%and 48%,respectively.(3)The turbidity removal effect can only reach 14%,and the p H of the water was reduced after advanced oxidation unit treatment.Compared with the non-use of UV/H₂O₂advanced oxidation technology,the removal rates of GSM,2-MIB,TOC and COD_Mnin the effluent of the waterworks were increased in varying degrees,and the content of DO was increased.